How does one passively listen to other RF with wireless networking cards?

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How does one passively listen to other RF with wireless networking cards?

Hello, all. I'm running BT5 on an Acer Aspire One D257. It comes with a wireless card and is capable of monitoring radio frequencies(RF) with airmon-ng. So, my question is how do I monitor RF or go about monitoring RF outside the range of normal wireless networking communications? Is it possible to monitor analog signals too? I'm no dummy, I realize this could take scripting and/or knowledge of writing code for drivers or firmware. I would like to use this for CB radio for future marine applications, but anything would be cool. Anything pointing me in the right direction would be much appreciated, like other forums for such a question anything. Thanks in advance.

Note: I realize that the FCC have regulations against such a thing in the U.S., but my plan is to use this in international waters. I know the U.S. government like to think their laws applies to the rest of the world but they don't.